Getting "Authentication failure" error when adding an iSCSI target with CHAP in Windows 2008R2 Server

Hi all,

I would like to get some help from you guys about connecting to an iSCSI target portal in Windows 2008R2 Server using iSCSI initiator.

I have several NAS's (QNAP's and Synology) in my dept and I would like to connect to them via iSCSI with CHAP enabled. I can only connect to them without CHAP turned on but I can't if I enabled CHAP and I am getting  the "authentication failure" error for some reason. The secret password is 16 characters long (letters and numbers only).  I don't have IPSec enabled and I don't have mutual CHAP enabled as well. I make sure the login information matches on both NAS and iSCSI initiator. I have tired to connect these NAS's from other systems none of them can connect to them with CHAP enabled.

Can someone walk me through the troubleshooting steps?

Thanks.